Buggy code:
public class HttpStatusTests { private Map < Integer , String > statusCodes = new LinkedHashMap < Integer , String > ( ) ; @ Before public void createStatusCodes ( ) { statusCodes . put ( 100 , "CONTINUE" ) ; statusCodes . put ( 101 , "SWITCHING_PROTOCOLS" ) ; statusCodes . put ( 102 , "PROCESSING" ) ; statusCodes . put ( 103 , "CHECKPOINT" ) ; statusCodes . put ( 200 , "OK" ) ; statusCodes . put ( 201 , "CREATED" ) ; statusCodes . put ( 202 , "ACCEPTED" ) ; statusCodes . put ( 203 , "NON_AUTHORITATIVE_INFORMATION" ) ; statusCodes . put ( 204 , "NO_CONTENT" ) ; statusCodes . put ( 205 , "RESET_CONTENT" ) ; statusCodes . put ( 206 , "PARTIAL_CONTENT" ) ; statusCodes . put ( 207 , "MULTI_STATUS" ) ; statusCodes . put ( 208 , "ALREADY_REPORTED" ) ; statusCodes . put ( 226 , "IM_USED" ) ; statusCodes . put ( 300 , "MULTIPLE_CHOICES" ) ; statusCodes . put ( 301 , "MOVED_PERMANENTLY" ) ; statusCodes . put ( 302 , "FOUND" ) ; statusCodes . put ( 303 , "SEE_OTHER" ) ; statusCodes . put ( 304 , "NOT_MODIFIED" ) ; statusCodes . put ( 305 , "USE_PROXY" ) ; statusCodes . put ( 307 , "TEMPORARY_REDIRECT" ) ; <START_BUG> statusCodes . put ( 308 , "RESUME_INCOMPLETE" ) ; <END_BUG> statusCodes . put ( 400 , "BAD_REQUEST" ) ; statusCodes . put ( 401 , "UNAUTHORIZED" ) ; statusCodes . put ( 402 , "PAYMENT_REQUIRED" ) ; statusCodes . put ( 403 , "FORBIDDEN" ) ; statusCodes . put ( 404 , "NOT_FOUND" ) ; statusCodes . put ( 405 , "METHOD_NOT_ALLOWED" ) ; statusCodes . put ( 406 , "NOT_ACCEPTABLE" ) ; statusCodes . put ( 407 , "PROXY_AUTHENTICATION_REQUIRED" ) ; statusCodes . put ( 408 , "REQUEST_TIMEOUT" ) ; statusCodes . put ( 409 , "CONFLICT" ) ; statusCodes . put ( 410 , "GONE" ) ; statusCodes . put ( 411 , "LENGTH_REQUIRED" ) ; statusCodes . put ( 412 , "PRECONDITION_FAILED" ) ; statusCodes . put ( 413 , "REQUEST_ENTITY_TOO_LARGE" ) ; statusCodes . put ( 414 , "REQUEST_URI_TOO_LONG" ) ; statusCodes . put ( 415 , "UNSUPPORTED_MEDIA_TYPE" ) ; statusCodes . put ( 416 , "REQUESTED_RANGE_NOT_SATISFIABLE" ) ; statusCodes . put ( 417 , "EXPECTATION_FAILED" ) ; statusCodes . put ( 418 , "I_AM_A_TEAPOT" ) ; statusCodes . put ( 419 , "INSUFFICIENT_SPACE_ON_RESOURCE" ) ; statusCodes . put ( 420 , "METHOD_FAILURE" ) ; statusCodes . put ( 421 , "DESTINATION_LOCKED" ) ; statusCodes . put ( 422 , "UNPROCESSABLE_ENTITY" ) ; statusCodes . put ( 423 , "LOCKED" ) ; statusCodes . put ( 424 , "FAILED_DEPENDENCY" ) ; statusCodes . put ( 426 , "UPGRADE_REQUIRED" ) ; statusCodes . put ( 428 , "PRECONDITION_REQUIRED" ) ; statusCodes . put ( 429 , "TOO_MANY_REQUESTS" ) ; statusCodes . put ( 431 , "REQUEST_HEADER_FIELDS_TOO_LARGE" ) ; statusCodes . put ( 500 , "INTERNAL_SERVER_ERROR" ) ; statusCodes . put ( 501 , "NOT_IMPLEMENTED" ) ; statusCodes . put ( 502 , "BAD_GATEWAY" ) ; statusCodes . put ( 503 , "SERVICE_UNAVAILABLE" ) ; statusCodes . put ( 504 , "GATEWAY_TIMEOUT" ) ; statusCodes . put ( 505 , "HTTP_VERSION_NOT_SUPPORTED" ) ; statusCodes . put ( 506 , "VARIANT_ALSO_NEGOTIATES" ) ; statusCodes . put ( 507 , "INSUFFICIENT_STORAGE" ) ; statusCodes . put ( 508 , "LOOP_DETECTED" ) ; statusCodes . put ( 509 , "BANDWIDTH_LIMIT_EXCEEDED" ) ; statusCodes . put ( 510 , "NOT_EXTENDED" ) ; statusCodes . put ( 511 , "NETWORK_AUTHENTICATION_REQUIRED" ) ; } @ Test public void fromMapToEnum ( ) { } @ Test public void fromEnumToMap ( ) { } }

Fix:
statusCodes . put ( 308 , "PERMANENT_REDIRECT" ) ;